Caractérisation numérique couplée fluide-aérothermique/structure dédiée à partir de techniques aux frontières immergées

Abstract : Characterization of heat transfer mechanisms between an incompressible fluid flow and solid structure is the main objective of the proposed work. From a solver developed within the team, we particularly focused on strategies for coupling with a solid solver to address both energy and structure motion. In our approach, the model treating solid part is the solver ASTER and specific attention was paid to the coupling strategy. In the fluid / structure coupling part, reference cases were performed with increasing complexity and immersed boundaries was investigated. The change in topology for the Immersed Boundary Method enhances here and there some numerical instability and the latter can be more or less damped by hybrid techniques in the treatments to submerged borders.Despite such limitations, the solver is able to handle large deformation ensuring robust and fast analysis for the characterization of strongly coupled mechanisms. To emphasize such a point, isothermal flow in a cavity representing a cold-cell was conducted as part of the research project OSEO. To our knowledge, the processing performed for the first time quantified the effect of opening (in the opening and closing of the doors of the cell phases) on the flow and heat exchange. Such modeling is then used to suggest improvements to the geometry being analyzed.
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Hong Quan Luu. Caractérisation numérique couplée fluide-aérothermique/structure dédiée à partir de techniques aux frontières immergées. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. Français. ⟨NNT : 2013ESMA0032⟩. ⟨tel-00957783⟩

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